Figure 1.
Exposure-response curves for the effects of environmental factors
The exposure-response curves for exposure to ambient temperature (A), PM2.5 (B), PM10 (C), NO2 (D), SO2 (E), and O3 (F) versus case fatality due to COVID-19 (exposure window I) are shown. The solid and dashed lines represent log (hazard ratio) values and the 95% CIs, respectively. Definition of abbreviations: CI, confidence interval; PM2.5, particulate matter with an aerodynamic diameter ≤2.5 μm; PM10, particulate matter with an aerodynamic diameter ≤10 μm; SO2, sulfur dioxide; NO2, nitrogen dioxide; O3, ozone.